JSFiddle - React, Tailwind, and code Playground

HTML

<p><input id="input1" type="text" value="1"></p>
<p><input id="input2" type="text" value="2"></p>
<p><input id="input3" type="text" value="3"></p>

JavaScript

function addEvent(element,evName,fn) {
        if (element.addEventListener) {
            element.addEventListener(evName,fn,false);
        } else if (element.attachEvent) {
            element.attachEvent('on'+evName,function(e) {
                fn(e || window.event);
            });
        }
    }


function kbHandler(e) {
    var which = e.keyCode || e.charCode;
    if (which != 13) alert(which);
}

window.onload = function() {
    addEvent(document.getElementById('input1'),'keyup',kbHandler);
    addEvent(document.getElementById('input2'),'keyup',kbHandler);
    addEvent(document.getElementById('input3'),'keyup',kbHandler);
}